将SQL Server Compact 4.0.0.1与实体框架4.3

本文关键字：实体 框架 Compact SQL Server | 更新日期: 2023-09-27 18:24:59

错误：

Could not load System.Data.SqlServerCe.Entity.dll. Reinstall SQL Server Compact.

内部异常：

{"Could not load file or assembly 'System.Data.SqlServerCe.Entity, Version=4.0.0.1, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"System.Data.SqlServerCe.Entity, Version=4.0.0.1, Culture=neutral, PublicKeyToken=89845dcd8080cc91"}

复制步骤：

  1. 创建新的MVC3应用程序

  2. 添加Nuget包EntityFramework。SqlServerCompact

    <package id="EntityFramework.SqlServerCompact" version="4.1.8482.2" />

  3. 创建模型

    public class TaskItem
{
    [Key]
    public int Id { get; set; }
    public string Description { get; set; }
}

  4. 创建DbContext

    public class TestContext : DbContext
{
    public DbSet<TaskItem> TaskItems { get; set; }
}

  5. 家庭控制器

    public ActionResult Index()
{
    var db = new TestContext();
    // breakpoint on Add() below
    db.TaskItems.Add(new TaskItem { Description = "Get shit done."});
    return View();
}

  6. Web.config连接字符串、运行时和System.Data

    <add name="ApplicationServices" connectionString="Data Source=|DataDirectory|Test.sdf" providerName="System.Data.SqlServerCe.4.0" />

    <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845dcd8080cc91" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SqlServerCe.4.0" />
      <add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </DbProviderFactories>
  </system.data>

问题：

Web.config都是默认值。。。这里没什么好玩的。。。所有DLL都是本地复制的并且在bin中。。。我错过了什么？这一定是非常简单的事情。

更新：

从web.config中删除Dependent Assembly部分解决了问题，但我仍然需要解释原因，以便结束答案。

将SQL Server Compact 4.0.0.1与实体框架4.3

从web.config 中删除依赖程序集绑定

  <dependentAssembly>
    <assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845dcd8080cc91" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
  </dependentAssembly>

检查是否在项目上创建了此代码

EntityFramework.SqlServerCompact.cs under the App_Start folder
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
[assembly: WebActivator.PreApplicationStartMethod(typeof(MyStory.Tests.App_Start.EntityFramework_SqlServerCompact), "Start")]
namespace MyStory.Tests.App_Start {
    public static class EntityFramework_SqlServerCompact {
        public static void Start() {
            Database.DefaultConnectionFactory = new SqlCeConnectionFactory("System.Data.SqlServerCe.4.0");
        }
    }
}
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